Rotary brush



Oct. 27, 1925--v 1,558,544r

A. C. HOLZAPFEL ET AL ROTARY BRUSH Filed Sept. 7, 1922 3 Sheets-Sheet 1.

z J /Z 6 7 MMJMM Oct. 27, 1925- 1,558,544

A. C. HOLZAFEL ET AL ROTARY BRUS H Filed Sent: '7, 1922 3 Sheets-Sheet 2 grt/vento@ akamu Patented Oct. 27, 1925.

` UNITED STATES PATENT OFFICE. N

ALBERT C. HOLZAPFEL AND ARTHUR M. HOLZAPFEL, 0F NEW YORK, N. Y.

ROTARY BRUSH.

Application led September '7, 1922. Serial No. 586,739.

To all whom t may concern:

Be it known that we, ALBERT C. I-IoLzAP- FEL and ARTHUR M. IIoLzArFnL, a citizen ofthe United States and a subject of the King of Great Britain, respectively, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Rotary Brushes, of which the following is a specification.

This invention relates to rotary brushes, and more particularly to laminated scraping brushes.

An object of the invention is the provision of a brush having flat laminated elements to reduce breakage.

In the present invention, we provide a hub grooved interiorly for the reception of a fastening wire and having a plurality of radial openings through which the plates project. The inner ends of the plates are provided with openings for the passage of the fastening wire. It has heretofore been customary to employ a looped plate with the fastening wire passing through the loop to retain the wire in position. l/Ve have found that in such brushes, the breakage Lgenerally occurs at the bottom of the loop adjacent the hub, and we, therefore, provide straight plates fastened at their inner ends and laminated on each side.

In` cleaning surfaces covered with hard rust, scale and the like, we employ a brush consisting of plates, and centrifugally operated hammers. The hammers are slightly longer than the plates and are pivoted to small spindles attached to the hub. The number of hammers employed may be varied within desired limits, but we have found it advantageous to employ one or more hammers to each circumferential row of scraping elements and have the hammers eX- tending spirally of the brush so that only one kor two hammers contact with the sur-` face to be cleaned at the same time.

In the accompanying drawings, we have shown several embodiments of the invention. In this showing:

Figure 1 is a front elevation of one form i Figure 6 is a front elevation of another form of brush,

Figure 7 is a transverse sectional view thereof, on line 7 7 of Figure 6,

Figure 8 is a detail sectional view on line 8 8 of Figure 6,

Figure 9 is a similar view 0n line 9 9 of Figure 6,

Figure 10 is an end elevation of one form of hub,

Figure 11 is a plan view thereof,

Figure 12 is a side elevation of another form of hub,

Figure 13 is an interior view of another form of hub,

Figure 14 is an interior view of the hub shown in Figure 12,

Figure 15 is a side elevation of the hub shown in Figure 13, and,

Figure 16 is a detail view of the scraping element showing another manner of retaining the same in position.

Referring to Figures 1 to 5 of the drawings, the reference numeral 1 designates a hub which, as shown, is formed in two sections lsubstantially semi-circular in cross section. The interior of each section is cut out, forming a substantially circular opening through the hub when the sectionsV are assembled. These sections are `adapted to be mounted on a driving spindle 2 and retained thereon by suitable fastening element 3. In this form of the invention, the scraping elements are shown arranged in Lcircumferential rows. The inner face of each hub section isprovided with a plurality of grooves 4 and radial openings 5 extending through the hub from the exterior, communicating with these grooves. As shown, the outer edges of the openings are rounded (see Figure 2). Each scraping element consists of a central plate 6, and shorter/plates 7 and 8, arranged on each side thereof, forming a laminated scraping element. In the use of the brush, the center element 6 touches the surface for cleaning and the shorter elements merely reinforce or strengthen it. The lower ends of each of the plates of the scraping element are provided with openings 9.V These openings are adapted -to re ceive a fastening wire 10, arranged in the groove 4.

For removing hard rust, scale, and the like, a plurality of pivoted hammers 11 are arranged on the hub, and extend slightly beyond the scraping elements. As shown, each of the hammers is provided with an enlarged outer surface 12 to more effectually remove the scale or rust. The hammers are pivotally mounted in recesses 13, formed in the outer surface of the hub. As shown, the inner ends of the hammers are provided with openings 14, for the reception of pivot pins 15 which are' passed through these openings and received in the hub. In assembling the brush, one or more hammers are arranged in each circumferential row..v and these hammers are best disposed in spiral paths, whereby only one or two hammers striks the surface being cleaned at the same time.

In the form of the invention shown in Figures 6 to 9 of the drawings, the scraping elements and hammers are each arranged in spiral paths. The construction of the scraping elements is the same as in the form of the invention heretofore described, and they extend through radial openings in a hub 16. rIhis hub, as shown, is in the form of a sleeve or hollow cylindrical body adapted to receive the driving spindle 2. It is provided with a spiral groove 17 on its inner face, adapted to receive a fastening wire 18 which extends from one end of the hub to the other, and is passed through the openings 9 in the brush elements. rIhe construction of the hammer support is the same as in the form of the inventionheretofore described.

Referring to Figures 10 to 15 of the drawings, the method of cutting the grooves and radial openings in the hub will be described. The radial openings 5 are so small that it is impossible to cut or punch them through the material of which the hub is formed. In constructing a hub for use in the form of brush shown in Figures 1 to 5 of the drawings, the grooves 4 are cut in the interior of the two sections of the hub, one of which is shown in Figure 18 of the drawings. These grooves are cut to a predetermined depth and a plurality of longitudinal grooves 19 are then cut in the outer surface of the hub. rIhe depth of the grooves 19 plus the depth of the grooves 4 is equal to or slightly greater than the thickness of the hub wherebythe radial openings 5 are formed where the grooves intersect.

Instead of forming the interior grooves circumferentially the hub may be provided with a plurality of interior longitudinal grooves 20A as shown in Figures 10 and 11 of the drawings. The circumferential grooves are then cut on the exterior of the iiubf as shown in Figure` 11- and the' intersection of these two sets of grooves forms radial openings 22 similar to the openings 5. A hub constructed in this manner will form a brush substantially similar to the brush shown in Figures 1 to 5 of the drawings having the brush elements arranged in circumferential rows. The fastening wires however are arranged interiorly of the hub as shown in Fig. 16. In this form of the invention the center opening of the hub is larger and the fastening element 24 is disposed in the space interiorly of the hub, preventing outward movement of the scraping element.

In forming the spiral brush shown in Figures 6 to 9 of the drawings, the spiral grooves 17 are lirst formed on the interior of the hub and a plurality of longitudinal grooves 23 are then formed on the exterior. rlhe intersections of these two sets of grooves form the radial openings 16.

Instead of using a fastening wire extending through the interior grooves of the brush a substantially U-shaped clamping element may be passed through the holes 9 in the scraping elements as shown in Figure 16 of the drawings. This element may be formed by passing a straight piece of wire through the holes 9 and then bending it to the desired form. As the scraping element substantially fills the radial openings in the hub the clamping element 24 will be disposed in the interior groove and will` prevent displacement of the brush element.

The operation of the device will be apparent from the foregoing description. The brush is revolved in any suitable manner, and the scraping elements and hammers contact with the surface to be cleaned.v The hammers loosen hard rust, scale and the like and the scraping elements then remove all loose material from the surface, at the same time acting as bearing members for the hammers and permit the tops of the hamers to strike the surface in an even and efficient manner.

By providing scraping elements consisting` of a'relatively long member 6 which is adapted to contact with the surface being cleaned, and shorter elements arranged on each side thereof. liability of breakage is reduced to a minimum. A further advantage is the provision of a scraping element consisting of straight plates projecting radially from the hub, which plates are provided with openings for the reception of a fastening wire. By rounding the outer edges of the radial openings 5, the scraping elements are made more flexible and liability of breakage due to the sharp edge that would otherwise Contact with thescraping element is reduced.

It is to be understood that the forms of our invention herewith shown and described are to be taken as preferred examples oat-the saine, and that various changes in the shape, size, and arrangement of parts may be resorted to Without departing from the spirit oit the invention or the scope of the sul joined claims.

l-lavingr tlnis desrribed our invention, We Claim:

l. A rotary brush comprising a hub, a plurality of' scraping elements projecting troni said hub, each of said scraping elements comprising a substantially straight flat plate, and a plurality of similar plates arranged on each side thereof, said plates being ot progressiyely shorter lengths, and means lor securing' said scraping elements to said hub.

2. A rotary brush comprising a hub having a groove formed on its interior, said hub being` Ltnrther provided with radial openings extending 'from said groove to the eX- terior thereof, scraping elements projecting through said openings, each of said elements comprising a substantially straight, flat plate and a plurality oi shorter plates arranged on each side thereof, the innerA ends oit said plates being provided with openings, and a fastening` Wire mounted in said groove and passing through the openings in said plates to retain the strips in position.

3. A brush hub provided with interior and exterior intersecting grooves, the depth ot the grooves being such that radial openings are formed at the points of intersection.

ln testimony whereof We aili'x our signae tures.

ALBERT o. HOLZAPFEL. ARTHUR M. HoLzAPFEL. 

